Improvement in boilers for making paper-pulp from wood



ATENE FFICE@ MORRIS L. KEN, OF ROYERS FORD, PENNSYLVANIA.

IMPROVEMENT IN BOILERS FOR MAKING PAPER-PULP FROM WOOD.

Specification forming part of Letters Patent No. 25,4 B S, datedSeptember 13, 1859.

- To LZZ whom, it may concern,.-

Beit known that I, MoRRrs L. KEEN,of Royers Ford, in the county ofMontgomery and State of Pennsylvania, have invented certain new anduseful Improvements in Boilers for Boiling Wood orLigneous Materials forMaking Paper-Pulp Under Pressure; and I do hereby declare that thefollowing is a full, clear, and exact description of theconstruction andoperation of the same, reference being had to the accompanying drawings,in which- Figure l represents a perspective view of said boiler. Fig. 2represents a vertical central section through the same.

My invention relates to the construction of a boiler for boiling woodand ligneous materials for making'paper-pulp, in which proper provisionis made for keeping` the stock covered by the alkali or liquid used andgiving it motion to insure the mass being properly boiled throughout,and a discharge valve or cock, by means of which the stock, when sut'-ficiently boiled, is blown out in a pulpy state.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation.

A represents a vertical cylindrical boiler, which is mounted on supportsB, or on any other suitable frame. The upper part of the boiler is madeconical,and is provided with an expansion-chamber, O, through theaperture of which the boiler is charged, and which is closed by a cover,D, which is bolted steamtight to the same. The bottom of the boiler A ismade funnel-shaped and ends in the center in the discharge-pipe E. whichis closed by a piston or stop-cock, G. The latter is secured to the rodH,and can be opened or closed by means of the hand-wheel F of the rod H,which passes through the stufng-box I and has its lower bearing in thebracket c. K represents two stirrers, the shafts of which run attheirlower ends inthe steps b, while their upper ends pass th rough thestuffing-boxes L,and are provided with pinions M,which are driven bysuitable gearing. The shafts ofthe stirrers K are provided on one sideonly with the horizontal stirring-arms, which, when the boiler is to becharged, are turned toward the periphery of the boiler, and aretherefore notin the way of the material as it is thrown into the boiler.

d represents a perforated plate, which is secured to the rod N, andwhich rests on the brackets g of the expansion-chamber C. Itis intendedto press the material down and to keep it submerged in the fluid inwhich it is to be boiled. The plate d is prevent-ed from rising by theupper end of the rod N being in contact with the lower face of the coverD.

O represents try cocks, by which the material in the boiler can betried, to what degree of perfection the stock is Worked.

The operation is as follows: The boiler being charged with the propersolution of caustic alkali or other suitable duid, and with the materialwhich is to be reduced to pulp, the plate d is placed upon it and thecover D is screwed down tightly. The boiler A is then heated, either bya direct tire or by any other heating apparatus, and the mass in theboiler is boiled and stirred until thoroughly disintegrated. During thisprocess thetsteam arising from the duid rises through the perforatedplate d and fills the expansion chamber C, whence it exerts a pressureupon the boiling mass in the boiler. \Vhen the stock has been reduced tothe desired perfection, the stopcock G is opened by means of thehand-wheel F, and the entire mass is blown, .by the pressure of thesteam in the expansionchamber and boiler, through the pipe E, as apulp,into an open tank adjacent to the boiler A. rIhe expansion chamberC may be provided with a pipe leading to a steam-gage to indicate thepressure ot' steam in the boiler.

Having thus described my invention, what I claim is A boiler for boilingunder pressure wood and ligneous materials for making paper-pulp,constructed with an expansion-chamber, stirrers, and discharge valve orcock, arranged for the purposes and in the manner substantially asherein stated..

vMORRIS L. KEEN. Vi tn esses:

EPHRAIM MILLER, HUGH BURGEss.

